Possible Clues:

• Mad dog near bombed battleground ...
• Member and pensionable teacher in conflict, ultimately?
• Provide guns to mature gangster for final conflict
• A dictator finally gone mad, end of world catastrophically?
• Ancient sport seen on prime battle site
• Biblical battle
• Dear God! Man engineered the end of the world
• Weapon of antiquity put on battlefield
• Gun is as old as the hills for gangster in final battle
• A jolly ancient teacher's final battle!